120=0.5s^2+1.1s

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Solution for 120=0.5s^2+1.1s equation:


Simplifying
120 = 0.5s2 + 1.1s

Reorder the terms:
120 = 1.1s + 0.5s2

Solving
120 = 1.1s + 0.5s2

Solving for variable 's'.

Reorder the terms:
120 + -1.1s + -0.5s2 = 1.1s + -1.1s + 0.5s2 + -0.5s2

Combine like terms: 1.1s + -1.1s = 0.0
120 + -1.1s + -0.5s2 = 0.0 + 0.5s2 + -0.5s2
120 + -1.1s + -0.5s2 = 0.5s2 + -0.5s2

Combine like terms: 0.5s2 + -0.5s2 = 0.0
120 + -1.1s + -0.5s2 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
-240 + 2.2s + s2 = 0

Move the constant term to the right:

Add '240' to each side of the equation.
-240 + 2.2s + 240 + s2 = 0 + 240

Reorder the terms:
-240 + 240 + 2.2s + s2 = 0 + 240

Combine like terms: -240 + 240 = 0
0 + 2.2s + s2 = 0 + 240
2.2s + s2 = 0 + 240

Combine like terms: 0 + 240 = 240
2.2s + s2 = 240

The s term is 2.2s.  Take half its coefficient (1.1).
Square it (1.21) and add it to both sides.

Add '1.21' to each side of the equation.
2.2s + 1.21 + s2 = 240 + 1.21

Reorder the terms:
1.21 + 2.2s + s2 = 240 + 1.21

Combine like terms: 240 + 1.21 = 241.21
1.21 + 2.2s + s2 = 241.21

Factor a perfect square on the left side:
(s + 1.1)(s + 1.1) = 241.21

Calculate the square root of the right side: 15.530936868

Break this problem into two subproblems by setting 
(s + 1.1) equal to 15.530936868 and -15.530936868.

Subproblem 1

s + 1.1 = 15.530936868 Simplifying s + 1.1 = 15.530936868 Reorder the terms: 1.1 + s = 15.530936868 Solving 1.1 + s = 15.530936868 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-1.1' to each side of the equation. 1.1 + -1.1 + s = 15.530936868 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + s = 15.530936868 + -1.1 s = 15.530936868 + -1.1 Combine like terms: 15.530936868 + -1.1 = 14.430936868 s = 14.430936868 Simplifying s = 14.430936868

Subproblem 2

s + 1.1 = -15.530936868 Simplifying s + 1.1 = -15.530936868 Reorder the terms: 1.1 + s = -15.530936868 Solving 1.1 + s = -15.530936868 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-1.1' to each side of the equation. 1.1 + -1.1 + s = -15.530936868 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + s = -15.530936868 + -1.1 s = -15.530936868 + -1.1 Combine like terms: -15.530936868 + -1.1 = -16.630936868 s = -16.630936868 Simplifying s = -16.630936868

Solution

The solution to the problem is based on the solutions from the subproblems. s = {14.430936868, -16.630936868}

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